Ok, so I have got a new 5" tach w/shiftlight an I have been wanting to instal it for about 2 months now but I ned some help on wireing it in. I know where the red, black an white wire goes but what do I connect the green wire to? (The green wire is the one that sends the signal to the tach.) I thout about just splicing into the same wire that runs into the dash to the factory tach but do yall think that will even work? Someone just give me some edvice on wiring up my new tach on my 04 silverado 5.3. Thanks